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Poster Open Access

Two new close (sep~3arcsec) and nearby common parallax and proper motion pairs at d~15pc (F1+M4_phot) and d~11pc (M4.5+T1_phot) in Gaia EDR3

Scholz, Ralf-Dieter

Among 88 nearby stars at d<20pc with lacking colours but
measured parallaxes in Gaia EDR3 we found two new close
(separations~3arcsec) common parallax and proper motion
(CPPM) companions. The companion of a nearby
(d=14.98pc) F1 star, HD 105452 B, was already imaged
with the Hubble Space Telescope and now confirmed with Gaia.
We classified it photometrically as M4 dwarf.
The other CPPM companion, SCR J1214-2345 B orbits an M4.5
dwarf at d=10.77pc and represents the faintest brown dwarf
discovery with Gaia. It was imaged in the                
VISTA Hemisphere Survey and partly detected in the
near-infrared. Our photometric classification of
T1+-3 needs spectroscopic confirmation.

A corresponding short paper was published in RNAAS: https://iopscience.iop.org/article/10.3847/2515-5172/abea23 (see also: https://arxiv.org/abs/2103.00144 )
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